Liquid ring pump



FIG. 1 is a top plan view of a liquid ring pump showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view thereof, and

FIG. 5 is a left side elevational view thereof. 

The ornamental design for liquid ring pump, as shown. 